#!/usr/bin/perl -w
use strict;

# Copyright (C) 2006, HELM Team.
#
# This file is part of HELM, an Hypertextual, Electronic
# Library of Mathematics, developed at the Computer Science
# Department, University of Bologna, Italy.
#
# HELM is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
#
# HELM is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with HELM; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place - Suite 330, Boston,
# MA  02111-1307, USA.
#
# For details, see the HELM World-Wide-Web page,
# http://helm.cs.unibo.it/

use CGI;
use Syntax::Highlight::Universal;

# Configuration

my $documentroot = '/projects/matita/public_html/';
my $protohrc = $documentroot . 'helm-proto.hrc';
my $scriptsdir = $documentroot . 'library/';

my %formatmap = (
  '.ma' => 'grafite',
  '.c' => 'c',	# debug
);

# Code
  
my $query = CGI->new;                      # used globally by some 'sub' below
print $query->header(-type=>'text/html', -charset=>'utf-8');

sub die_invalid_file() {
  print $query->start_html;
  print 'Invalid script.';
  print $query->end_html;
  exit 0;
}

sub lookup_script($) {
  my ($f) = @_;
  die_invalid_file() unless $f =~ /^(.*)(\.[^.]+)$/;
  my $base = $1;
  my $extension = $2;
  die_invalid_file() unless $base =~ /[-a-zA-Z_]+(\/[-a-zA-Z_])*/;
  die_invalid_file() unless exists $formatmap{$extension};
  my $path = $scriptsdir . $f;
  die_invalid_file() unless -f $path;
  return ($path, $formatmap{$extension});
}

my $fname = $query->param('f');

my $highlighter = Syntax::Highlight::Universal->new;
$highlighter->addConfig($protohrc);

my ($script, $format) = lookup_script($fname);
open SCRIPT, "< $script" or die "Can't open Matita script \"$script\"\n";
my @lines = <SCRIPT>;
my $text = join '', @lines;
close SCRIPT;

print $query->start_html(-style=>{'src'=>"/$format-format.css"},
			 -encoding=>'utf-8');
my $result = $highlighter->highlight($format, $text);
print "<pre>\n";
print $result;
print "</pre>\n";
print $query->end_html;